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1. Theory
The sound spectrum is generally divided into four intervals defined according to the wave emitted:
infrasound with frequencies between 0 and 16 Hz ;
audible sounds with frequencies between 16 Hz and 16 kHz ;
ultrasonic frequencies between 16 kHz and 200 MHz ;
hypersound frequencies above 100 GHz ;
Ultrasound is an elastic wave with all the general properties of sound waves, such as the deformation of the medium in which it propagates (figure 1 ).
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